有一个电阻R_x，其阻值大约在40Ω～50Ω之间，现要进一步准确地测量其电阻，需测量多组数据，手边现有器材如下：

电源E（电动势12V，内阻为0.5Ω）；

电压表（0～3～15V，内阻约为10kΩ）；

电流表（0～0.6～3A，内阻约为1Ω）；

滑动变阻器R₁（阻值0～10Ω，额定电流2A）；

滑动变阻器R₂（阻值0～1750Ω，额定电流0.3A）；

开关S和导线若干．

根据材料内容，从方框中选择恰当的单词填空，使材料意思完整、通顺，有的需要变换形式。

    Once，there was a young painter who was good at painting birds．His paintings sold____ and he was famous all over his country．

    The emperor(皇帝)loved Collecting paintings,especially roosters(公鸡)．____he asked the famous painter to paint a roosters for him．He wanted the roosters to be the best of all his collections．

    The painter____to do so．The emperor waited and waited for one year,but did not get the painting．He became____and asked the painter to come to see him．

    The painter came．He walked into the palace____paper,paints and a brush(刷子)．In five minutes，a perfect picture of a rooster____on the Paper．Seeing this，the emperor was all the more angry．"If you can paint a picture of a rooster in five minutes，____did you keep me waiting for a year?"he said．

    "I'll let you know why,Your Majesty,"said the painter．"Could you please come with me?"

    He____the emperor to his own study(书房)．There，paper almost filled the____．On each paper was a painting of a rooster．

    "Your Majesty,"said the painter．"It took____one year to improve my skill in order to paint a perfect rooster for you．"

读单词找出划线读音不同的一个。

某个质量为m、带电量为﹣q（q＞0）的小球仅在重力作用下从静止开始沿竖直向下方向做匀加速直线运动，一段时间后在小球运动的空间中施加竖直方向的匀强电场，小球又经过相等的时间恰好回到出发点，则（   ）

根据短文内容，选择正确答案。  

    Here is a photo. The two girls have big blue eyes and long brown hair. They are both ten years old. They are in the same class. The one in a yellow skirt is Lily. The other one (另一个) an orange skirt is Lucy. Their father (父亲) is Mr. White. He is in a brown coat. Their mom is Mrs. White. She is in a black dress. Who is that boy in a blue cap? He is Lucy and Lily's brother(哥哥), Bob. He is a high school student. Look! Lucy and Lily are in a green car.